Weldless, drop forged, carbon steel shackle with an eye bolt which has a metric coarse threaded end. Please specify Ungalvanized (Black) or Galvanized shackle is required. Ungalvanized. Size: Body dia: 20mm, Opening: 31mm, Screw Pin Thread: M 24, Clear Length: 92mm, Pin dia: 24mm, S.W.L: 2.5ton.